package com.renewable.gateway.util;

import java.security.MessageDigest;

/**
 * Created by geely
 */
public class MD5Util {

	private static String byteArrayToHexString(byte b[]) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++)
			resultSb.append(byteToHexString(b[i]));

		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n += 256;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	/**
	 * 返回大写MD5
	 *
	 * @param origin
	 * @param charsetname
	 * @return
	 */
	private static String MD5Encode(String origin, String charsetname) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			if (charsetname == null || "".equals(charsetname))
				resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
			else
				resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
		} catch (Exception exception) {
		}
		return resultString.toUpperCase();
	}

	public static String MD5EncodeUtf8(String origin) {
//        origin = origin + PropertiesUtil.getProperty("password.salt", "");
		return MD5Encode(origin, "utf-8");
	}


	private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
			"6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

}
